If we choose to live near convergent plate boundaries, we can build buildings that can resist earthquakes, and we can evacuate areas around volcanoes when they threaten to erupt. Yes, convergent boundaries are dangerous places to live, but with preparation and watchfulness, the danger can be lessened somewhat.
Nitrification, as stated above, is formally a two-step process; in the first step ammonia is oxidized to nitrite, and in the second step nitrite is oxidized to nitrate. Different microbes are responsible for each step in the marine environment.
Just watch your levels and do a partial water change when the ammonia and nitrite spike. You may have enough bacteria in your substrate to bring it back under control in less time if your tank was already cycled. It may take weeks for the bacteria to re-colonize in your filter.